You can tap it to create a token of a nonlegendary creature, give it haste and then sacrifice it at the beginning of the next end step
If you don't control an Army, create a 0/0 black Orc Army creature token first.) You can cast Treason of Isengard without a target just to amass Orcs
Having two of those qualities doesn't make an object more historic than another or provide an additional bonusan object either is historic or it isn't
The downsides are once again pretty clear: for what it's worth, it's not a great FlickerFlicker target, but is also very susceptible to removal and doesn't do a whole lot on its own
Grisly Salvage , Mulch , and Skull Prophet could give you more milling to feed your foraging abilities if you prefer that to sacrificing Food tokens.
This orc dragon enters swinging with flying and haste, and it even has hexproof for safety on the turn it comes down